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Electromagnetic wave absorbing material formed by planar 2:17 rare earth-3d transition intermetallic compounds

A technology of absorbing materials and electromagnetic waves, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve problems such as unusable, large matching thickness, and application restrictions, and achieve the effects of eliminating electromagnetic interference, meeting miniaturization, and satisfying absorption

Inactive Publication Date: 2010-11-10
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large matching thickness of the material in the prior art, its application is limited, and it is even completely unusable in some special application fields

Method used

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  • Electromagnetic wave absorbing material formed by planar 2:17 rare earth-3d transition intermetallic compounds
  • Electromagnetic wave absorbing material formed by planar 2:17 rare earth-3d transition intermetallic compounds
  • Electromagnetic wave absorbing material formed by planar 2:17 rare earth-3d transition intermetallic compounds

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Experimental program
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Effect test

specific Embodiment approach

[0020] a. First smelting rare earth elements, iron and cobalt into alloys, and then quenching after fully homogenizing treatment at high temperature, then pulverizing and grinding the alloys into fine particles, and then performing ball milling to obtain metal powder.

[0021] b. Mix the prepared rare earth transition group intermetallic compound powder with the uncured bonding material with a volume ratio of 1~9:9~1 and put it into a mold made of non-magnetic material, place it in 10 -4 In a magnetic field of ~10T (Tesla), the mold is rotated at a speed of 1 ~ 200 rpm in the magnetic field at the same time until the bonding material is solidified.

[0022] The preferred material preparation method of the present invention is that mold is placed in 10 -4 ~10T (Tesla) magnetic field, the mold rotation speed is 1~200 rpm.

[0023] Below are two preferred embodiments of the present invention:

Embodiment 1

[0025] Weigh 2.080 grams of neodymium and 6.518 grams of iron, and melt them into ingots under the protection of argon. Annealed in a vacuum quartz tube at 1000 °C for one week. Grind the annealed ingot into particles of about 70 microns with an agate mortar, and then wet-mill the particles with 60 ml of n-hexane in an agate ball mill jar with a ball-to-material ratio of 10:1 and a ball milling speed of 200 rev / min, using forward and reverse ball milling, the time interval is 1 hour, the total time of ball milling is set to 16 hours, and finally the sample is dried to obtain Nd 2 Fe 17 Material. Then the sample is divided into 3 kinds of composites: (1) the paraffin wax diluted with n-hexane is mixed with a volume ratio of 35; , pressed into shape under a pressure of 1 MPa, and then taken out for microwave testing. (2) The paraffin wax diluted with n-hexane is mixed uniformly at a volume ratio of 35:65, and after drying, it is placed in a mold (the inner diameter is 3.04 m...

Embodiment 2

[0030] Weigh 2.312 grams of cerium, 2.254 grams of cobalt and 4.984 grams of iron, and melt them into ingots under the protection of argon. Annealed in a vacuum quartz tube at 1000 °C for one week. Grind the annealed ingot into particles of about 70 microns with an agate mortar, and then wet-mill the particles with 60 ml of n-hexane in an agate ball mill jar with a ball-to-material ratio of 10:1 and a ball milling speed of 200 rev / min, using forward and reverse ball milling, the time interval is 1 hour, the total time of ball milling is set to 16 hours, and finally the sample is dried to obtain Nd 2 Fe 17 Material. Then the sample is divided into 3 kinds of composites: (1) the paraffin wax diluted with n-hexane is mixed with a volume ratio of 35; , pressed into shape under a pressure of 1 MPa, and then taken out for microwave testing. (2) The paraffin wax diluted with n-hexane is mixed uniformly at a volume ratio of 35:65, and after drying, it is placed in a mold (the inne...

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Abstract

The invention provides a material which can absorb electromagnetic waves and is formed by transition intermetallic compounds. The general formula of the material is R2(Co1-xFex)17, wherein R in the general formula is Nd or Ce; when R is Nd, x is not more than 1 and not less than 0, when R is Ce, x is not more than 0.8 and not less than 0.6; and the direction of easy magnetization of the material is vertical to the C axis. The special description is as follows: if the components meet the above general formula but the direction of easy magnetization of the material is parallel to the C axis, the material is not suitable for serving as the material absorbing electromagnetic waves. A method for preparing a composite material by utilizing the material of the invention is characterized by placing the material of the invention into non-cured binding materials, after fully mixing the material and the non-cured binding materials uniformly, placing the mixture into a die manufactured by nonmagnetic materials, placing the die in the magnetic field and ensuring the die to rotate in the magnetic field, and carrying out orientation.

Description

technical field [0001] The invention relates to a material capable of absorbing electromagnetic waves and a compound material capable of absorbing electromagnetic waves prepared from the material. The invention is a material capable of absorbing electromagnetic waves composed of transition group intermetallic compounds. Background technique [0002] With the development of science and technology and communication technology, computers, mobile phones, disks, etc. have been widely used in the process of information generation and transmission, but the wide application of this electromagnetic wave material has brought increasingly serious problems of electromagnetic radiation and electromagnetic interference. An effective way to overcome electromagnetic wave interference is to use electromagnetic wave absorbing materials. [0003] Chinese invention patent application 200710049468.X discloses a rare-earth-doped rare-earth iron-based wave-absorbing material mainly composed of α-F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/10C22C33/02H05K9/00
Inventor 李发伸伊海波左文亮刘忻
Owner LANZHOU UNIVERSITY
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